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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce1aded451ae450a7148d7b931f98da89a097c33af0f4ea1646ba8df17e7cb0d' 
  AND token = '8Om4VXbchggBI94tRe0/dHf1eedBBLT0srj23xQsVPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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