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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ec7a9fa25a898691108e5e9ccbcaf1ba457df73732d0412a9493d13216f9842' 
  AND token = 'qBsKjt1Zl3WTx1+1p6cTQ+KM5IwOS+WR+cOkqjepEPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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