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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e073c0cd658efe829a5b81c40bcadef6c6388f8f4033bb34aed600a17bdfc5c' 
  AND token = 'C1t0+FxXN1O4bnQhKBpaEp/W5sSVi/1BL35iCeO5DL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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