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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '076d618214216bd3280baa0322cbc8cbc76b9fed604dcb7bd50885b4e24848ff' 
  AND token = 'B4ajBejCETOl89oc1dab9iEl1eirgQgKdhacRomc960=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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