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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbd4e317ef41ed2a4f23466e244ebc2f2741c02f939ec728ce63474c66d5e1ad' 
  AND token = 'ayNiNQXGkdpJjvCNZmu+2MZmV1j0gyk2RTcU2ndc7bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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