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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f70c34f3ac81c20954ad3f9a9b7df792b6c1fea4545ccd7bc67e59ea4fd59bf' 
  AND token = '+Oo4Y9B7LSz+TPm4RFKbEK6Et+Jcux3PssA06S+tpeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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