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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c1b26e44ad0672231361faab67d57e59d32f89441493854b1b71d0fcf8b64ff' 
  AND token = 'OfaibdJrHifR708cJc/QuvsTGuVQN1Xnz800qw6uBmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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