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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93e076cd7b6fffe9d0b4501953c891587db7e98178af97660bfb2b5ed175fb4e' 
  AND token = '0158/HIfzNd5y49Q/q2L0ufb/DAxXGJiVlfvPZLTjPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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