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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fdf2e29f527b84477386c2156d891cbb5d708ee2f2911b11a1cb1a36dbdcd29' 
  AND token = 'ihD7bBkBwM3YpJZfs9Q7NL3YJ6mfVS2cNt7qEybdoUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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