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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89e39dc0855eff8a9ab602c0fd78c78a3749be7dab3a98677bf853f17fabfdbe' 
  AND token = 'jfCy1Ofe7W9rA7lw7fot8Xei2vCecgHdPkm/t5GoZVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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