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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c04065ce115208018d63137e80e14173f3c23d711d0e50ab7d37db815be9e85' 
  AND token = 'pY70Yb88TSi5xMFZwASDxZbRgFHfckKN60A0HQxqYpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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