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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8f81d86d40a09f21c2475247448df51c00599e9bece36d3619cf17d298f17ef' 
  AND token = 'kAGxcYkrDE8Ar0xlYGt1jnjCrUQZrmtJlvk5nBH/Mcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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