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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1975483dcce13533f260bf8c1cb0219eda3e0f6ab75e6505c9cca7cb38df03c8' 
  AND token = 'vTcaRAv6xde5Mt4mVJyrLrhNJkw41dIz6e98nP/9pYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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