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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be49543f5e97573142a186b0e7026b4cb29ab7c3022c4cac2f84abe45c109880' 
  AND token = 'CGA0l1lopCHkZfSt6JheTIQ5PiOD9IgQOezA482q3NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}