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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b63718ed2560a2ca0596fa4c94f8865535e826cdc50afe71d279adba832964c2' 
  AND token = '0Ea+0dPwx1f+RIoPfzDC+ndW6JUSVBr3G2fkRHMZ/bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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