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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '195d01ff1f329136a832720184af0cac6342c0ee6a9e008c6e4266383779edee' 
  AND token = 'TtZjHb9efU8eqa62barV6zR/qVCjoBW2dLhs5WybWN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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