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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f06e295f0acebc0054911e925078dcc0378ffc13a9cd764fce340fb66cfd462' 
  AND token = 'FZogDDIa1u7fL/JlySk+3ZKk8cHsuS4nfqUyYNRFQVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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