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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c5676861ea1b86b13dfaaf210aeeea6cf039ecca2037a713d7712fb62cbde0' 
  AND token = 'xUAHPlEwa6vnZkvSAod+F/X1SmvJLLDa+Frms5PfJmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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