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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbce19276f325499b5a2539c128a1c7c5ac8bc0563005d4485573d6338e01905' 
  AND token = 'rLIi3CgjP0q6zgSUH5wXi48q5NNqlkKRkFiOXnVbNXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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