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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709b5837b838dcaa2d923e9b3a515baade1dcfb4254f3833cf6429b6e74988e0' 
  AND token = '1yy05RcHEWFEtQT6k/hmA6Gr9aP4dc7/QMGOjsXxN/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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