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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c756f5f05e0d15cbbfd33c555c19f8c05d906e26cea0beb45a64d137d08d4c8' 
  AND token = '+tbKseug3X/lmAmHQHt5n221nOCSetwgsQHLb/nb6xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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