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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcd87b5307aff1cfdd20f399d349239a5268025493769ded68106f3db208382a' 
  AND token = 'k3FmZXf93rkztrPzX2w9DkUww8+izaAcQwf9DvDXzm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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