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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c70071c9d0fa591b0fe8046b0d90b9e51ebbf09234dbc22a2c8f386048d967e' 
  AND token = 'HnNH1bygVX4x+Cg70vg+8kqfsPYCFkSpIM5kRDqVFj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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