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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b028fe7039bd901b2d076e54b641a184b481f3f352c6c8048c89bfe1fa3542b6' 
  AND token = 'jFS1doyqz+nb1bOOMqP2vw14AmftTeZUTISVSUZ2zgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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