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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '616081980dac848103a844b99a669994841c55232e59778a63ced614126441df' 
  AND token = 'i6XjZWTf4PMpiT0caL/sCQlkJG9n+Fk7q8Qg5rqi8JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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