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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4930d2345f4136a0939dd0f67ce167f0a919d17c5369347bc7683687bea0ef00' 
  AND token = 'WYjdOGeWqdL5ReJU1BirDupaP4hkdIO+6D50Bwiw2U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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