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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db96ff7d5f03f182b883f43d18318884440093989dcdf0134021526fcd3de11d' 
  AND token = '9SBo5tN2N5ce1AZC3dvGgcKhAnTqK4kkkvLLeWy6kLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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