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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '706f295ede7ca3d2d5808f42c47e5cdbadd812a5278590621241245e0e04eda6' 
  AND token = 'uCSZLd0Lbr4cvSW9vVEuegHQ+lAWxfMtUp7o6CUtfGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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