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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9676c2e6a29044cbf7eb271f732357f333fd597ede3bde470681b24d99ee4cc' 
  AND token = '4E5H+dNqC6whl8c2c4icnTQVj10nSrK/c/Nt6s6nQi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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