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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b52e6ca2b7cfb9ad18d0242b6af38dd5d555eb05270beceddedc59e05465b7e' 
  AND token = '0Mx4OSxYM5MY7KGMPPeGezUtT2URiG+L1bDsGssVkig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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