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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd5426c5918d4372c47824d986900dfbb4880f29c01810882d5b674b711d56ad' 
  AND token = 'Eja2ConbuEdYzgDLmF4ziFxJ54gW2E0NNj7M7ADoEqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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