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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6feb05645e2bf7a918422e89e064e7780e6b2d877bc48768e55ec1ca6e53332b' 
  AND token = 'erB0ogh/W39zi7I5sUtFoqqR3l9ez7heYNpzWmeflDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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