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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c315b056911abe233ea73933f0c4f3a88aa453fb4cc7dfa81a9a4f911ed7e145' 
  AND token = '11O2yqP0wGW/Lc5BK38Cma9IyDUb1q3i1gkhGGsJaxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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