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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4750428f413e43b5882dfdc6d3f0392270e9169186c3ba8a20e876846dc860d' 
  AND token = 'pOhv/5ddfgd7FNoTtbyenO05/xQsNeUW0PMI+BEFoI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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