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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd13610c8da24a2865b19dfa6b8ef49e1dd81ef0edcd0ab82332612f1b17a7327' 
  AND token = 'u7zUjLy2Llw05NR2RLwGA6w/7gcDEaEtNb2IhknB5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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