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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0526bcd5afd714503c7cb8bd4f971b98b2b5dff82d73387f2c5f861a63abb9ec' 
  AND token = 'q9LpNGt1F77bPOTzfJE6AeQhL2UEJZkt4/rPknX+/o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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