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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b62b87b5a89a2e0e0856f4ece9e1bbae83ff0e7fe577c41e2768044f824a1ed2' 
  AND token = 'x1A6bsGhEGby9tc/l2mgd6mM8aRt/KFuzg+eUQxYDSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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