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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a3ac107fd17f15e2ea951400b01c18ea53a1133e75a3b8988f799c2bd6ba1a0' 
  AND token = 'TlytXNr93MpCeAgsCRGNidFHGRyfZr2ZFd+lzVuy2ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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