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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1838a065cd29d135b546515ec3256149367935ce300fe6d045086d335ca67e3' 
  AND token = 'iiJUcyP8Gsi75tD+TOaOthQy1Sz7z/V0WgUNDbF2k9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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