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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fbf1f3b34367e3f18863fc515c9e351fbb90ef7875987d21d6f790554da27c5' 
  AND token = 'vZ5aKZPLYkv4oFnPKP9h4fY4QgNxblriktSb5Nulqlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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